The reason of this is, when ClearCase starts to support a Linux Distro version (for instance Ubuntu 12.04 LTS, Red Hat 6.3 or SuSE 11 Sp2), is expected to
have all Kernel Versions - officially provided by the vendors to each distribution - supported as well.

Given the above, what I need to verify is whether my kernel version actually belongs to a Linux Distro version supported by ClearCase.

On my example if I browse to the Red Hat link below (on References), I'll realize 2.6.32-279.el6 belongs to Red Hat 6.3 and then going back the CC system Requirements List I'll know that is supported by CC 7.1.2.8 (or higher) or CC 8.0.0.4 (or higher).

Finally is a good idea to be sure which distribution are you using, for recent Linux Distro Versions you can run "lsb_release -a" command to get the Distribution name and version.

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